[3320] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini hostname implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
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| 6 | *
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| 7 | * Adjusted by Erik Andersen <andersen@codepoet.org> to remove
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| 8 | * use of long options and GNU getopt. Improved the usage info.
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| 9 | *
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| 10 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 11 | */
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| 12 | #include "libbb.h"
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| 13 |
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| 14 | static void do_sethostname(char *s, int isfile)
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| 15 | {
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| 16 | // if (!s)
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| 17 | // return;
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| 18 | if (isfile) {
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| 19 | parser_t *parser = config_open2(s, xfopen_for_read);
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| 20 | while (config_read(parser, &s, 1, 1, "# \t", PARSE_NORMAL & ~PARSE_GREEDY)) {
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| 21 | do_sethostname(s, 0);
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| 22 | }
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| 23 | if (ENABLE_FEATURE_CLEAN_UP)
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| 24 | config_close(parser);
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| 25 | } else if (sethostname(s, strlen(s))) {
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| 26 | // if (errno == EPERM)
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| 27 | // bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
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| 28 | bb_perror_msg_and_die("sethostname");
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| 29 | }
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| 30 | }
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| 31 |
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| 32 | /* Manpage circa 2009:
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| 33 | *
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| 34 | * hostname [-v] [-a] [--alias] [-d] [--domain] [-f] [--fqdn] [--long]
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| 35 | * [-i] [--ip-address] [-s] [--short] [-y] [--yp] [--nis]
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| 36 | *
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| 37 | * hostname [-v] [-F filename] [--file filename] / [hostname]
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| 38 | *
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| 39 | * domainname [-v] [-F filename] [--file filename] / [name]
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| 40 | * { bbox: not supported }
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| 41 | *
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| 42 | * nodename [-v] [-F filename] [--file filename] / [name]
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| 43 | * { bbox: not supported }
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| 44 | *
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| 45 | * dnsdomainname [-v]
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| 46 | * { bbox: supported: Linux kernel build needs this }
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| 47 | * nisdomainname [-v]
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| 48 | * { bbox: not supported }
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| 49 | * ypdomainname [-v]
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| 50 | * { bbox: not supported }
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| 51 | *
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| 52 | * -a, --alias
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| 53 | * Display the alias name of the host (if used).
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| 54 | * { bbox: not supported }
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| 55 | * -d, --domain
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| 56 | * Display the name of the DNS domain. Don't use the command
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| 57 | * domainname to get the DNS domain name because it will show the
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| 58 | * NIS domain name and not the DNS domain name. Use dnsdomainname
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| 59 | * instead.
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| 60 | * -f, --fqdn, --long
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| 61 | * Display the FQDN (Fully Qualified Domain Name). A FQDN consists
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| 62 | * of a short host name and the DNS domain name. Unless you are
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| 63 | * using bind or NIS for host lookups you can change the FQDN and
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| 64 | * the DNS domain name (which is part of the FQDN) in the
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| 65 | * /etc/hosts file.
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| 66 | * -i, --ip-address
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| 67 | * Display the IP address(es) of the host.
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| 68 | * -s, --short
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| 69 | * Display the short host name. This is the host name cut at the
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| 70 | * first dot.
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| 71 | * -v, --verbose
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| 72 | * Be verbose and tell what's going on.
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| 73 | * { bbox: supported but ignored }
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| 74 | * -y, --yp, --nis
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| 75 | * Display the NIS domain name. If a parameter is given (or --file
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| 76 | * name ) then root can also set a new NIS domain.
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| 77 | * { bbox: not supported }
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| 78 | * -F, --file filename
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| 79 | * Read the host name from the specified file. Comments (lines
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| 80 | * starting with a `#') are ignored.
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| 81 | */
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| 82 | int hostname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 83 | int hostname_main(int argc UNUSED_PARAM, char **argv)
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| 84 | {
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| 85 | enum {
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| 86 | OPT_d = 0x1,
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| 87 | OPT_f = 0x2,
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| 88 | OPT_i = 0x4,
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| 89 | OPT_s = 0x8,
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| 90 | OPT_F = 0x10,
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| 91 | OPT_dfis = 0xf,
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| 92 | };
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| 93 |
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| 94 | unsigned opts;
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| 95 | char *buf;
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| 96 | char *hostname_str;
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| 97 |
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| 98 | #if ENABLE_LONG_OPTS
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| 99 | applet_long_options =
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| 100 | "domain\0" No_argument "d"
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| 101 | "fqdn\0" No_argument "f"
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| 102 | //Enable if seen in active use in some distro:
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| 103 | // "long\0" No_argument "f"
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| 104 | // "ip-address\0" No_argument "i"
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| 105 | // "short\0" No_argument "s"
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| 106 | // "verbose\0" No_argument "v"
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| 107 | "file\0" No_argument "F"
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| 108 | ;
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| 109 |
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| 110 | #endif
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| 111 | /* dnsdomainname from net-tools 1.60, hostname 1.100 (2001-04-14),
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| 112 | * supports hostname's options too (not just -v as manpage says) */
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| 113 | opts = getopt32(argv, "dfisF:v", &hostname_str);
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| 114 | argv += optind;
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| 115 | buf = safe_gethostname();
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| 116 | if (applet_name[0] == 'd') /* dnsdomainname? */
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| 117 | opts = OPT_d;
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| 118 |
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| 119 | if (opts & OPT_dfis) {
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| 120 | /* Cases when we need full hostname (or its part) */
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| 121 | struct hostent *hp;
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| 122 | char *p;
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| 123 |
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| 124 | hp = xgethostbyname(buf);
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| 125 | p = strchrnul(hp->h_name, '.');
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| 126 | if (opts & OPT_f) {
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| 127 | puts(hp->h_name);
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| 128 | } else if (opts & OPT_s) {
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| 129 | *p = '\0';
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| 130 | puts(hp->h_name);
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| 131 | } else if (opts & OPT_d) {
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| 132 | if (*p)
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| 133 | puts(p + 1);
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| 134 | } else /*if (opts & OPT_i)*/ {
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| 135 | if (hp->h_length == sizeof(struct in_addr)) {
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| 136 | struct in_addr **h_addr_list = (struct in_addr **)hp->h_addr_list;
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| 137 | while (*h_addr_list) {
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| 138 | printf("%s ", inet_ntoa(**h_addr_list));
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| 139 | h_addr_list++;
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| 140 | }
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| 141 | bb_putchar('\n');
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| 142 | }
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| 143 | }
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| 144 | } else if (opts & OPT_F) {
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| 145 | /* Set the hostname */
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| 146 | do_sethostname(hostname_str, 1);
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| 147 | } else if (argv[0]) {
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| 148 | /* Set the hostname */
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| 149 | do_sethostname(argv[0], 0);
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| 150 | } else {
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| 151 | /* Just print the current hostname */
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| 152 | puts(buf);
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| 153 | }
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| 154 |
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| 155 | if (ENABLE_FEATURE_CLEAN_UP)
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| 156 | free(buf);
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| 157 | return EXIT_SUCCESS;
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| 158 | }
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